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                TG No. 144                                                            August 1987

                                                    CHAPTER 5
                                    OCCUPATIONAL AND ENVIRONMENTAL STANDARDS


                5-1. ISOCYANATES (C-4A'C *,IV).

                    a. The only isocyanate monomer found in aliphatic PUP is HDI and Is the
                ingredient which has generated the majority of concern. This Is because
                isocyanates, In general, are known to be sensitizers and irritants. HDI is
                present in the uncured PUP coating and may be released during thermal
                decomposition of the cured PUP coating.

                    b. The Occupational Safety and Health Administration (OSHA) has no
                established PEL values for HDI. The NIOSH Publication No. 78-215 recommends a
                ceiling value of 0.02 ppm (0.14 mg/m3Y for any 10-minute sampling period and
                a time-weighted average (TWA) concentration of 0.005 ppm (.035 mg/m3) for
                any work shift up to 10 hours. According to AR 40-5, paragraph 5-3, The
                Surgeon General has adopted these values as exposure limits for Army
                employees. Note: The ACGIH has published a notice of Intended change In the
                TLV Booklet to establish a TLV of 0.005 ppm for HDI with no ceiling value.

                5-2. SOLVENTS. All paints, primers, and thinners contain organic solvents.
                In addition, spray operations require thinning with organic solvents to
                achieve the desired viscosity. Organic solvents are also used to clean up
                painting equipment and to clean the substrate prior to painting. As indicated
                In Appendix C, the solvent composition and percentages for the paints, primers
                and thinners vary. However, TLVs or PELs have been established for the
terials. Per AR
                40-5, the Army will comply with the more stringent of the TLV or PEL
                provisions.
                5-3. LEAD. Pigments used In the paints and primers may contain lead. A TWA
                of 0.05 Mg/M3 for any work shift up to 10 hours has been established by OSHA
                for lead (29 CFR 1910.1025).

                5-4. CHROMIUM VI. The paints and primers may contain water insoluble
                chromium VI compounds. These substances have a TLV of 0.05 mg/m', as
                chromium, and are recognized as having carcinogenic or cocarcinogenic
                potential.

                5-5. OTHER METALS. Metals present In the pigments must be determined by
                using the MSDS and/or the analyses. References should be checked to establish
                appropriate exposure limits.

                5-6. ADDITIVE PROPERTIES. When similar chemical compounds are encountered
                which elicit similar physiological reactions, the additive effects must be
                considered. Procedures for establishing standards for these compounds are
                contained in the ACGIH TLV Booklet and the OSHA Standards (29 CFR 1910.1000).


                                                       5-1




                                                                                              80
Box ID = BX000000
Unit = VII CORPS       
Parent Organization = ARCENT          
Folder Title = PORT OPERATIONS CARC PAINTING POLICY                                                            
Subject = ARMY REGULATION 11-34 (RESPIRATORY PROTECTION PROGRAM
Document Number =        103
Image file name = 00000126.tif

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